Rapid high-frequency cleaning system for shell-and-tube heat exchanger

Abstract

The utility model provides a shell-and-tube heat exchanger fast high-frequency cleaning system which comprises a high-frequency cleaning machine and a blocking mechanism, a water inlet of the high-frequency cleaning machine is communicated with a water inlet of a first shell-and-tube heat exchanger through a heater, and a water outlet of the first shell-and-tube heat exchanger is communicated with a water inlet of a second shell-and-tube heat exchanger. A water outlet of the second shell-and-tube heat exchanger is communicated with a water return port of the high-frequency cleaning machine; the blocking mechanism is arranged in the end of each shell-and-tube heat exchanger and blocks a communication opening between the shell-and-tube heat exchangers. The blocking mechanism is used for isolating the primary side water inlet and outlet pipeline, physical and chemical cleaning is carried out in combination with the high-frequency oscillation cleaning technology, the difficulty of cleaning operation is greatly reduced, and the contradiction between the poor cleaning effect, the low cleaning efficiency and the continuous production and long maintenance period of the shell-and-tube heat exchanger is solved; the device has the advantages of simple structure, convenience in use and high efficiency.

Description

Technical Field

[0001] The utility model relates to the field of heat exchanger cleaning, in particular to a quick high-frequency cleaning system for a shell and tube heat exchanger. Background Art

[0002] Shell and tube heat exchanger is also called shell and tube heat exchanger. It is a wall heat exchanger that uses the wall of the tube bundle enclosed in the shell as the heat transfer surface. This type of heat exchanger has a simple structure, low cost, wide flow cross-section, easy to clean scale, and can be used under high temperature and high pressure. It is the most widely used type of heat exchanger.

[0003] Shell and tube heat exchangers are mostly used in industrial production such as energy, chemical industry, and petroleum. During operation, iron oxides, scale, and other debris will be deposited, affecting the efficiency of the heat exchanger and even affecting the safe operation of the equipment, requiring shutdown for cleaning. At present, power plants use a large number of shell and tube heat exchangers for heat exchange. Due to the large number of heat exchangers, the long operation cycle of the heat exchangers, and the short downtime, the traditional cleaning method of setting up a temporary cleaning system can only clean one shell and tube heat exchanger at a time. And because the multiple heat exchangers in the power plant are connected for work, it is necessary to cut off the primary side inlet and outlet pipes and seal them during cleaning. After cleaning, the pipes need to be welded to restore the pipes. It is difficult to clean efficiently and quickly, which affects the equipment commissioning on schedule. Summary of the invention

[0004] In order to solve the problems existing in the background technology, the utility model proposes a quick high-frequency cleaning system for a shell and tube heat exchanger.

[0005] A quick high-frequency cleaning system for a shell and tube heat exchanger comprises a high-frequency cleaning machine and a blocking mechanism, wherein a water inlet of the high-frequency cleaning machine is connected to a water inlet of a first shell and tube heat exchanger through a heater, a water outlet of the first shell and tube heat exchanger is connected to a water inlet of a second shell and tube heat exchanger, and a water outlet of the second shell and tube heat exchanger is connected to a water return port of the high-frequency cleaning machine; and the blocking mechanism is arranged in the end of each shell and tube heat exchanger and blocks the connecting ports between the shell and tube heat exchangers.

[0006] Based on the above, the blocking mechanism includes a blocking device and a pressing device, the blocking device includes a blocking disk and a sealing member, the sealing member is arranged on the inner side of the blocking disk, and the pressing device is arranged between two blocking disks.

[0007] Based on the above, the pressing device includes a push rod and a synchronous tensioner. A socket is provided at the end of the outer side of the sealing disk corresponding to one end of the push rod, and the synchronous tensioner drives and connects the other end of the push rod.

[0008] Based on the above, the push rod is a screw rod, and the synchronous tightener is a threaded sleeve.

[0009] Based on the above, the sealing member is a rubber pad, and sealing rubber rings are respectively provided on the end and outer wall of the sealing member corresponding to the connecting port.

[0010] Based on the above, there are multiple plug holes, and the position of each plug hole on the blocking disk is set corresponding to the end position of the connecting port.

[0011] Based on the above, it includes an L-shaped support frame, one end of which is set on the shell side partition through bolts, and the other end of the support frame is placed at the bottom of the tube side end head cavity; a through hole is set on the support frame, and the push rod is passed through the through hole.

[0012] Based on the above, it includes a connecting flange, which corresponds to the water inlet and outlet of the tube side of the shell and tube heat exchanger. The connecting flange is provided with a water inlet, a water outlet and an exhaust port. The water outlet of the high-frequency cleaning machine is connected to the water inlets on the two heat exchanger connecting flanges through valves, the return water port of the high-frequency cleaning machine is connected to the water outlets on the two heat exchanger connecting flanges through valves, and the exhaust port of the high-frequency cleaning machine is connected to the exhaust ports on the two heat exchanger connecting flanges.

[0013] Based on the above, a water inlet pipe and a drain pipe are respectively arranged in the end cavity of the heat exchanger, one end of the water inlet pipe is connected to the water inlet of the connecting flange, one end of the drain pipe is connected to the drain outlet of the connecting flange, and the other end of the water inlet pipe and the other end of the drain pipe are respectively arranged near the bottom of the end cavity of the heat exchanger; an exhaust pipe is also arranged in the heat exchanger, one end of the exhaust pipe is arranged near the top of the end cavity of the heat exchanger, and the other end of the exhaust pipe is connected to the exhaust outlet of the connecting flange.

[0014] Based on the above, including the overflow water tank and the sewage storage tank, a circulating water tank is arranged in the high-frequency cleaning machine, an agitator is arranged in the circulating water tank, the top of the side wall of the circulating water tank is connected to the overflow water tank, and the bottom of the circulating water tank and the bottom of the overflow water tank are respectively connected to the sewage storage tank.

[0015] The utility model has substantial characteristics and progress compared with the prior art. Specifically, the utility model adopts a blocking mechanism to isolate the primary side inlet and outlet water pipes, and combines high-frequency oscillation cleaning technology to perform physical and chemical cleaning, which greatly reduces the difficulty of the cleaning operation, solves the contradiction between poor cleaning effect, low cleaning efficiency, and long continuous production and maintenance cycle of shell and tube heat exchangers, and has the advantages of simple structure, easy use and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the system structure of the utility model.

[0017] Figure 2 This is a schematic diagram of the structure of the heat exchanger end cavity of the utility model ( Figure 1 and Figure 2 Only two sets of middle push rods are shown).

[0018] Figure 3 It is a structural schematic diagram of the sealing disk of the utility model.

[0019] Figure 4 This utility model Figure 3 Schematic diagram of the enlarged structure at point A in the middle.

[0020] Explanation of the reference numerals: 1. High-frequency cleaning machine; 2. Overflow water tank; 3. Sewage storage tank; 4. Heater; 5. Connecting flange; 6. First shell and tube heat exchanger; 7. Exhaust pipe; 8. Connecting port; 9. Push rod; 10. Second shell and tube heat exchanger; 11. Valve; 12. Threaded sleeve; 13. Support frame; 14. Water inlet pipe; 15. Drain pipe; 16. Sealing disk; 17. Seal; 18. Socket; 19. Sealing rubber ring. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] like Figure 1-Figure 4 As shown, a quick high-frequency cleaning system for a shell and tube heat exchanger includes a high-frequency cleaning machine 1 and a blocking mechanism, wherein the water inlet of the high-frequency cleaning machine 1 is connected to the water inlet of the first shell and tube heat exchanger through a heater 4, the water outlet of the first shell and tube heat exchanger 6 is connected to the water inlet of the second shell and tube heat exchanger 10, and the water outlet of the second shell and tube heat exchanger is connected to the water return port of the high-frequency cleaning machine 1; the blocking mechanism is arranged in the end of each shell and tube heat exchanger and blocks the connecting port 8 between the shell and tube heat exchangers.

[0023] In reality, the ends of the shell and tube heat exchanger can be opened, and the ends are provided with connecting ports 8 for connecting different heat exchangers. When in use, the ends of the shell and tube heat exchanger are first opened, and the connecting ports 8 in the ends are blocked by the blocking mechanism, and then the ends are closed, and the pipelines of the high-frequency cleaning machine 1 are connected to the heat exchanger, and then the high-frequency cleaning machine 1 is started for cleaning.

[0024] Specifically, a connecting flange 5 is provided at the water inlet and outlet of the tube side of the shell and tube heat exchanger, and the connecting flange 5 is provided with a water inlet, a water outlet and an exhaust port. The water outlet of the high-frequency cleaning machine 1 is connected to the water inlets on the two heat exchanger connecting flanges 5 through a valve 11, and the water return port of the high-frequency cleaning machine 1 is connected to the water outlets on the two heat exchanger connecting flanges 5 through a valve, and the exhaust port of the high-frequency cleaning machine 1 is connected to the exhaust ports on the two heat exchanger connecting flanges 5. A water inlet pipe 14 and a drain pipe 15 are provided in the heat exchanger end cavity, one end of the water inlet pipe 14 is connected to the water inlet of the connecting flange 5, and one end of the drain pipe 15 is connected to the drain port of the connecting flange 5. The other end of the water inlet pipe 14 and the other end of the drain pipe 15 are respectively provided near the bottom of the heat exchanger end cavity, so as to facilitate better drainage when the circulation direction is switched. An exhaust pipe 7 is also provided in the heat exchanger end cavity, one end of which is disposed near the top of the heat exchanger end cavity, and the other end of which is connected to the exhaust port of the connecting flange 5, so as to facilitate the discharge of the air disturbed by oscillation in the closed heat exchanger tube during the cleaning process, and to avoid damage caused by excessive air pressure. In practice, the direction of the cleaning cycle is changed by switching the valve on and off, so as to perform better cleaning, such as connecting the water inlet of the first shell and tube heat exchanger to the water outlet of the high-frequency cleaning machine 1, closing the water outlet of the first shell and tube heat exchanger to the water return port of the high-frequency cleaning machine 1, closing the water inlet of the second shell and tube heat exchanger to the water outlet of the high-frequency cleaning machine 1, and connecting the water outlet of the second shell and tube heat exchanger to the water return port of the high-frequency cleaning machine 1, so as to perform high-frequency cleaning machine 1-first shell and tube heat exchanger-second shell and tube heat exchanger-high Cleaning in the circulation direction of the high-frequency cleaning machine 1; after a certain period of time, switching is performed to connect the water inlet of the second shell and tube heat exchanger with the water outlet of the high-frequency cleaning machine 1, close the water outlet of the second shell and tube heat exchanger and the return water port of the high-frequency cleaning machine 1, close the water inlet of the first shell and tube heat exchanger and the water outlet of the high-frequency cleaning machine 1, and connect the water outlet of the first shell and tube heat exchanger to the return water port of the high-frequency cleaning machine 1, thereby performing cleaning in the circulation direction of high-frequency cleaning machine 1-second shell and tube heat exchanger-first shell and tube heat exchanger-high-frequency cleaning machine 1.

[0025] The high-frequency cleaning machine 1 adopts the existing high-frequency cleaning machine 1, and a circulating water tank is provided in the high-frequency cleaning machine 1, and an agitator is provided in the circulating water tank. The agitator is controlled, connected and powered by the control system in the high-frequency cleaning machine 1. After adding water and cleaning agent into the circulating water tank, the agitator is used to stir and mix. After the high-frequency cleaning machine 1 starts working, the cleaning water in the circulating water tank is heated and sent into the tube path of the shell and tube heat exchanger for high-frequency oscillation cleaning and chemical cleaning. After the return water after cleaning enters the circulating water tank, it is sent into the shell and tube heat exchanger again for cleaning. The top of the side wall of the circulating water tank is connected to the overflow water tank 2. Due to the oscillation effect during the return water process, part of the water agent will overflow into the overflow water tank 2 for temporary storage. In practice, a water pump is provided in the overflow water tank 2, and a liquid level sensor is provided in the overflow water tank 2. The control system inside the high-frequency cleaning machine 1 is electrically connected to the liquid level sensor and the water pump. When the liquid level in the overflow water tank 2 reaches a preset value, the water pump is started to pump the water agent in the overflow water tank 2 into the circulating water tank. The bottom of the circulating water tank and the bottom of the overflow water tank 2 are connected to the dirt storage tank 3 through valves respectively. After cleaning, the valves are opened to discharge the dirt cleaned from the bottom of the circulating water tank and the overflow water tank 2 into the dirt storage tank 3.

[0026] The blocking mechanism includes a blocking device and a pressing device. The blocking device includes a blocking disk 16 and a sealing member 17. The sealing member 17 is provided on the inner side of the blocking disk 16, and the pressing device is provided between the two blocking disks 16. The blocking disk 16 is disk-shaped, so as to better fit and be sleeved outside the connecting port 8. The sealing member 17 directly contacts the connecting port 8 and seals the connecting port 8. In this embodiment, the pressing device includes a push rod 9 and a synchronous tensioner. A socket 18 is provided on the outer side of the blocking disk 16 corresponding to the end of one end of the push rod 9, and the synchronous tensioner drives the other end of the push rod 9. Specifically, the push rod 9 is a screw, and the synchronous tightener is a threaded sleeve 12. The upper and lower connecting ports 8 in the end cavity of the heat exchanger correspond to each other. After the sealing disk 16 is sleeved on the connecting port 8, one end of the screw is inserted into the socket 18 on the back of the sealing disk 16, and the other end of the screw is respectively sleeved into the threaded sleeve 12. The two screws are displaced back to back by rotating the threaded sleeve 12, thereby tightening the sealing disks 16 on the two connecting ports 8.

[0027] In this embodiment, the sealing member 17 is a rubber pad, and the sealing member 17 is provided with sealing rubber rings 19 at the ends and outer walls corresponding to the connecting port 8, respectively, and the sealing rubber rings are in contact with the ends and outer walls of the connecting port 8 to form a seal. In particular, in this embodiment, there are multiple, for example, 8, jacks 18, and the position of each jack 18 on the blocking plate 16 corresponds to the end position of the connecting port 8, so that each push rod 9 presses the sealing rubber ring against the end of the connecting port 8 to form a better seal.

[0028] Preferably, an L-shaped support frame 13 can also be arranged in the tube end head cavity, one end of the support frame 13 is arranged on the shell side partition plate by bolts, and the other end of the support frame 13 is placed at the bottom of the tube end head cavity. A through hole is arranged on the support frame 13, and when in use, a push rod 9 is first inserted into the through hole, and then the two push rods 9 are tightened. The diameter of the through hole is adapted to the outer diameter of the push rod 9, and the height of the support frame 13 is as close as possible to the upper part of the lower push rod 9, so as to play a supporting and strengthening role for the push rod 9, and avoid radial interference of the push rod 9 caused by the flowing liquid.

[0029] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-limiting from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A quick high-frequency cleaning system for a shell and tube heat exchanger, characterized in that: It includes a high-frequency cleaning machine and a sealing mechanism, wherein the water inlet of the high-frequency cleaning machine is connected to the water inlet of the first shell and tube heat exchanger through a heater, the water outlet of the first shell and tube heat exchanger is connected to the water inlet of the second shell and tube heat exchanger, and the water outlet of the second shell and tube heat exchanger is connected to the return water port of the high-frequency cleaning machine; the sealing mechanism is arranged in the end of each shell and tube heat exchanger and seals the connecting ports between the shell and tube heat exchangers; the sealing mechanism includes a sealing device and a top pressure device, the sealing device includes a sealing disk and a sealing member, the sealing member is arranged on the inner side of the sealing disk, and the top pressure device is arranged between the two sealing disks.

2. The quick high-frequency cleaning system for shell and tube heat exchanger according to claim 1 is characterized in that: The push-pressing device comprises a push rod and a synchronous tensioner. A plug hole is provided at the end of the outer side of the sealing disk corresponding to one end of the push rod, and the synchronous tensioner drives and connects the other end of the push rod.

3. The quick high-frequency cleaning system for shell and tube heat exchanger according to claim 2 is characterized in that: The push rod is a screw rod, and the synchronous tightener is a threaded sleeve.

4. The quick high-frequency cleaning system for shell and tube heat exchanger according to claim 1 is characterized in that: The sealing member is a rubber pad, and the end portion and the outer wall of the sealing member corresponding to the communicating port are respectively provided with sealing rubber rings.

5. The quick high-frequency cleaning system for shell and tube heat exchanger according to claim 2 is characterized in that: There are multiple insertion holes, and the position of each insertion hole on the blocking disk is arranged corresponding to the end position of the connecting port.

6. The quick high-frequency cleaning system for shell and tube heat exchanger according to claim 2 is characterized in that: It comprises an L-shaped support frame, one end of which is arranged on the shell side partition plate through bolts, and the other end of which is placed at the bottom of the tube side end head cavity; a through hole is arranged on the support frame, and a push rod is passed through the through hole.

7. The quick high-frequency cleaning system for shell and tube heat exchanger according to claim 1, characterized in that: It includes a connecting flange, which is arranged corresponding to the water inlet and outlet of the tube side of the shell and tube heat exchanger. The connecting flange is provided with a water inlet, a water outlet and an exhaust port. The water outlet of the high-frequency cleaning machine is connected to the water inlets on the two heat exchanger connecting flanges through valves, the return water port of the high-frequency cleaning machine is connected to the water outlets on the two heat exchanger connecting flanges through valves, and the exhaust port of the high-frequency cleaning machine is connected to the exhaust ports on the two heat exchanger connecting flanges.

8. The quick high-frequency cleaning system for shell and tube heat exchanger according to claim 1, characterized in that: A water inlet pipe and a drain pipe are respectively arranged in the end cavity of the heat exchanger, one end of the water inlet pipe is connected to the water inlet of the connecting flange, one end of the drain pipe is connected to the drain outlet of the connecting flange, and the other end of the water inlet pipe and the other end of the drain pipe are respectively arranged near the bottom of the end cavity of the heat exchanger; an exhaust pipe is also arranged in the heat exchanger, one end of the exhaust pipe is arranged near the top of the end cavity of the heat exchanger, and the other end of the exhaust pipe is connected to the exhaust outlet of the connecting flange.

9. The quick high-frequency cleaning system for shell and tube heat exchanger according to claim 1, characterized in that: It includes an overflow water tank and a sewage storage tank. A circulating water tank is arranged in the high-frequency cleaning machine. An agitator is arranged in the circulating water tank. The top of the side wall of the circulating water tank is connected to the overflow water tank. The bottom of the circulating water tank and the bottom of the overflow water tank are respectively connected to the sewage storage tank.

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